libstdc++-v3/testsuite/23_containers/unordered_map/operations/contains.cc

   1 // Copyright (C) 2018-2025 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // { dg-do run { target c++20 } }
  19
  20 #include <unordered_map>
  21 #include <testsuite_hooks.h>
  22
  23 void
  24 test01()
  25 {
  26   std::unordered_map<int, void*> m;
  27   VERIFY( ! m.contains( 0 ) );
  28   VERIFY( ! m.contains( 1 ) );
  29   m[0] = nullptr;
  30   VERIFY( m.contains( 0 ) );
  31   VERIFY( ! m.contains( 1 ) );
  32   m[1] = nullptr;
  33   VERIFY( m.contains( 0 ) );
  34   VERIFY( m.contains( 1 ) );
  35 }
  36
  37 int
  38 main()
  39 {
  40   test01();
  41 }